The present invention relates to oxazolidin-2-one subsituted pyrimidine compounds that act as PI3K (phosphatidylinositol-3-kinase) inhibitors, as well as pharmaceutical compositions thereof, methods for their manufacture and uses for the treatment of conditions, diseases and disorders dependent on PI3K.本發明係關於經唑啶-2-酮取代之嘧啶化合物,其用作PI3K(磷脂醯肌醇-3-激酶)抑制劑;以及其醫藥組合物,其製造方法,及其治療依賴於PI3K之病狀、疾病及病症的用途。